CPC C08L 23/16 (2013.01) [B29C 55/005 (2013.01); B29C 55/04 (2013.01); B29D 7/01 (2013.01); B29D 99/005 (2013.01); C08L 23/12 (2013.01); C08L 53/00 (2013.01); B29K 2023/12 (2013.01); B29K 2023/16 (2013.01); B29L 2031/712 (2013.01); C08F 210/16 (2013.01); C08L 2203/02 (2013.01); C08L 2203/162 (2013.01); C08L 2203/30 (2013.01)] | 28 Claims |
1. A microporous polymer film comprising:
one or more polypropylene copolymer, said one or more polypropylene copolymer comprising one or more polypropylene homopolymer chain segments and one or more ethylene-containing copolymer chain segments;
and wherein the microporous polymer film comprises:
(i) one or more polypropylene homopolymer chain segments in total amount of from 50-82 wt %, based on a weight of the microporous polymer film, or from 43-79 mole %, based on a mole content of polymerized units of propylene in the one or more polypropylene homopolymer chain segments as a percentage of a total mole content of polymerized monomer units in the microporous polymer film; and
(ii) one or more ethylene-containing copolymer chain segments in total amount of from 18-50 wt %, based on a weight of the microporous polymer film, or from 21-57 mole %, based on a mole content of polymerized monomer units in the one or more ethylene-containing copolymer chain segments as a percentage of a total mole content of polymerized monomer units in the microporous polymer film; wherein at least a portion of the one or more ethylene-containing copolymer chain segments comprises polymerized units of ethylene in an amount of at least 45 wt %, based on a weight of the one or more ethylene-containing copolymer chain segments, or at least 55 mole % based on a mole content of polymerized units of ethylene in the one or more ethylene-containing copolymer chain segments as a percentage of a total mole content of polymerized monomer units in the one or more ethylene-containing copolymer chain segments.
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